NL2029984A - Pvdf membrane and preparation device and method - Google Patents
Pvdf membrane and preparation device and method Download PDFInfo
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- NL2029984A NL2029984A NL2029984A NL2029984A NL2029984A NL 2029984 A NL2029984 A NL 2029984A NL 2029984 A NL2029984 A NL 2029984A NL 2029984 A NL2029984 A NL 2029984A NL 2029984 A NL2029984 A NL 2029984A
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- 239000012528 membrane Substances 0.000 title claims abstract description 215
- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims abstract description 92
- 238000002360 preparation method Methods 0.000 title claims description 25
- 238000000034 method Methods 0.000 title description 8
- 239000002033 PVDF binder Substances 0.000 claims abstract description 91
- 238000005520 cutting process Methods 0.000 claims description 13
- 238000010030 laminating Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000007731 hot pressing Methods 0.000 claims description 4
- 239000006057 Non-nutritive feed additive Substances 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- -1 respectively Polymers 0.000 claims 1
- 238000001125 extrusion Methods 0.000 abstract description 12
- 230000032683 aging Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 114
- 238000005034 decoration Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012745 toughening agent Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
- B29C48/0014—Extrusion moulding in several steps, i.e. components merging outside the die producing flat articles having components brought in contact outside the extrusion die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/16—PVDF, i.e. polyvinylidene fluoride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
- B29K2033/04—Polymers of esters
- B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention discloses a PVDF membrane including at least two stacked membrane layers. The at least two membrane layers are not arranged in parallel along a length direction of the PVDF membrane and the membrane layers in the stacked membrane layers. The PVDF membrane of the present invention includes at least two non-parallel membrane layers. An extrusion stretching direction of one of the membrane layers is taken as a length direction. At least one membrane layer which is non-parallel to the length direction is included. After the two non-parallel membrane layers are stacked and connected, the tensile strength in a non-length direction is increased, thereby increasing the transverse tensile strength and overall performance of the PVDF membrane, and further improving the aging resistance of the PVDF membrane.
Description
PVDF MEMBRANE AND PREPARATION DEVICE AND METHOD
[01] The present invention relates to the technical field of photovoltaic modules and surrounding supporting facilities, and in particular, to a PVDF membrane and a preparation device and method.
[02] In the prior art, a PVDF film is mainly produced by stretching in a longitudinal direction (a length direction of the PVDF film), resulting in poor tensile strength in a transverse direction (a width direction of the PVDF film), so that the overall structural strength of the PVDF film is reduced, and the low-temperature resistance is poor.
Besides, the PVDF film is also widely used in architectural decoration materials. When the PVDF film is used in architectural decoration, there are certain requirements for the weather resistance and bending resistance of the PVDF film. The overall performance of the PVDF film in the prior art is poor, which affects the service life of architectural decoration.
[03] Therefore, how to change the current situation in the prior art that the PVDF film has a poor transverse tensile strength leading to the reduction of the overall performance of the PVDF film becomes a problem to be solved urgently by a person skilled in the art.
[04] An object of the present invention is to provide a PVDF membrane and a preparation device and method, which solve the above problems existing in the prior art and improve the transverse tensile strength and overall performance of the PVDF membrane.
[05] In order to achieve the above object, the present invention provides the following solution. The present invention provides a PVDF membrane, including at least two stacked membrane layers. The at least two membrane layers are not arranged in parallel along a length direction of the PVDF membrane and the membrane layers in the stacked membrane layers, and are respectively made of polyvinylidene fluoride, polymethyl methacrylate, a toughening agent, and a processing aid.
[06] The number of the membrane layers is 2-5.
[07] When there are two membrane layers, an angle between the two membrane layers is not greater than 90° along the length direction of the PVDF membrane and the membrane layers. When there are three membrane layers, an angle between two adjacent membrane layers is 0-80° along the length direction of the PVDF membrane and the membrane layers. When there are more than three membrane layers, two membrane layers arranged in parallel are included.
[08] The present invention provides a PVDF membrane preparation device, including a pressure roller and at least two extruding machines capable of extruding a single membrane layer. Extrusion die axes of the at least two extruding machines are not arranged in parallel when there are not less than two extruding machines. The pressure roller is arranged at an intersection of the membrane layers extruded by the extruding machines, and the pressure roller is capable of integrally laminating the stacked membrane layers.
[09] The number of the extruding machines is 2-5. When there are two extruding machines, an included angle between the extrusion die axes of the two extruding machines is not greater than 90°. When there are not less than three extruding machines, an angle between two adjacent extruding machines is 0-80°.
[10] The pressure roller is provided with a heating element therein, and the pressure roller is capable of integrally hot-pressing the stacked membrane layers.
[11] The PVDF membrane preparation device further includes an edge cutting assembly. The edge cutting assembly is arranged on a side of the pressure roller away from the extruding machine, and the edge cutting assembly is capable of cutting a film obtained after laminating the membrane layers.
[12] The present invention also provides a PVDF membrane preparation method,
including: stacking at least two single membrane layers in which the at least two membrane layers are not arranged in parallel, and integrally solidifying an intersection of the membrane layers to obtain a PVDF membrane.
[13] Preferably, the number of the membrane layers is 2-5, and an angle between the two membrane layers is not greater than 90°. When there are three membrane layers, an angle between two adjacent membrane layers is 0-80°. When there are more than three membrane layers, two membrane layers arranged in parallel are included.
[14] The membrane layers are extruded by the extruding machines, and the intersection of multiple membrane layers is integrally hot-pressed to obtain the PVDF membrane. A preparation temperature of the PVDF membrane is 170-230°C.
[15] Compared with the prior art, the present invention achieves the following technical effect. The PVDF membrane of the present invention includes at least two stacked membrane layers. The at least two membrane layers are not arranged in parallel along a length direction of the PVDF membrane and the membrane layers in the stacked membrane layers, and are respectively made of polyvinylidene fluoride.
[16] The PVDF membrane of the present invention includes at least two non-parallel membrane layers. An extrusion stretching direction of one of the membrane layers is taken as a length direction. At least one membrane layer which is non-parallel to the length direction is included. After the two non-parallel membrane layers are stacked and connected, the tensile strength in a non-length direction is increased, thereby increasing the transverse tensile strength and overall performance of the PVDF membrane, and further improving the aging resistance of the PVDF membrane.
[17] The present invention also provides a PVDF membrane preparation device, including a pressure roller and at least two extruding machines capable of extruding a single membrane layer. Extrusion die axes of the at least two extruding machines are not arranged in parallel when there are not less than two extruding machines. The pressure roller is arranged at an intersection of the membrane layers extruded by the extruding machines, and the pressure roller is capable of integrally laminating the stacked membrane layers.
[18] The PVDF membrane preparation device of the present invention extrudes single membrane layers by using at least two extruding machines, and extrusion die axes of the at least two extruding machines are non-parallel to extrude non-parallel membrane layers. The pressure roller is capable of integrally laminating the stacked membrane layers at an intersection of the membrane layers extruded by the extruding machines.
The overall performance of the PVDF membrane is improved.
[19] The present invention also provides a PVDF membrane preparation method, including: stacking at least two single membrane layers in which the at least two membrane layers are not arranged in parallel, and integrally solidifying an intersection of the membrane layers to obtain a PVDF membrane.
[20] According to the PVDF membrane preparation method of the present invention, at least two single membrane layers are stacked, and the at least two membrane layers are not arranged in parallel. After integrally solidifying an intersection of the at least two membrane layers, a PVDF membrane with an improved transverse tensile strength is obtained, thereby improving the overall performance of the PVDF membrane, and prolonging the service life of a photovoltaic module.
[21] FIG. 1 is a schematic diagram of a PVDF membrane preparation device of the present invention.
[22] 1: membrane layer; 2: extruding machine; 3: pressure roller.
[23] Referring to FIG. 1, FIG. 1 is a schematic diagram of a PVDF membrane preparation device of the present invention.
[24] The present invention provides a PVDF membrane, including at least two stacked membrane layers 1. The at least two membrane layers 1 are not arranged in parallel along a length direction of the PVDF membrane and the membrane layers 1 in the stacked membrane layers 1. The membrane layers 1 are respectively made of polyvinylidene fluoride, polymethyl methacrylate, a toughening agent, and a processing aid.
[25] The PVDF membrane of the present invention includes at least two non-parallel membrane layers 1. An extrusion stretching direction of one of the membrane layers 1 is taken as a length direction. At least one membrane layer 1 which is non-parallel to the length direction is included. After the two non-parallel membrane layers 1 are stacked and connected, the tensile strength in a non-length direction is increased, thereby increasing the transverse tensile strength and overall performance of the PVDF membrane, fully utilizing the stretching orientation advantage of a PVDF molecular chain in a longitudinal direction, and further improving the aging resistance of the PVDF membrane.
[26] The number of the membrane layers 1 is 2-5. The number of the membrane layers 1 may be determined or suitably adjusted according to product requirements of a finished PVDF membrane.
[27] Specifically, when there are two membrane layers 1, an angle between the two membrane layers 1 is not greater than 90° along the length direction of the PVDF membrane and the membrane layers 1. The angle between the membrane layers 1 may be adjusted according to practical production requirements. When there are three membrane layers 1, an angle between two adjacent membrane layers 1 is 0-80° along the length direction of the PVDF membrane and the membrane layers 1. It should be noted that when there are more than three membrane layers 1, two membrane layers 1 arranged in parallel are included. When there are more membrane layers 1, two membrane layers 1 arranged in parallel may be selected. For example, the bottommost membrane layer 1 and the topmost membrane layer 1 are arranged in parallel, so as to enhance the structural integrity of the PVDF membrane.
[28] Meanwhile, the present invention provides a PVDF membrane preparation device, including a pressure roller 3 and at least two extruding machines 2. The extruding machines 2 are capable of extruding a single membrane layer 1. Extrusion die axes of the at least two extruding machines 2 are not arranged in parallel when there are not less than two extruding machines 2. The pressure roller 3 is arranged at an intersection of the membrane layers 1 extruded by the extruding machines 2, and the pressure roller 3 is capable of integrally laminating the stacked membrane layers 1.
[29] The PVDF membrane preparation device of the present invention extrudes single membrane layers 1 by using at least two extruding machines 2, and extrusion die axes of the at least two extruding machines 2 are non-parallel to extrude non-parallel membrane layers 1. The pressure roller 3 is capable of integrally laminating the stacked membrane layers 1 at an intersection of the membrane layers 1 extruded by the extruding machines 2. The overall performance of the PVDF membrane is improved.
[30] More specifically, the number of the extruding machines 2 is 2-5. When there are two extruding machines 2, an included angle between the extrusion die axes of the two extruding machines 2 1s not greater than 90°. When there are not less than three extruding machines 2, an angle between two adjacent extruding machines 2 is 0-80°.
The direction of extrusion dies of the extruding machines 2 can be adjusted so that the angle between the membrane layers 1 extruded by the extruding machines 2 can be easily adjusted to better perform the preparation of the PVDF membrane. It should be noted here that after the membrane layer 1 is extruded by the extruding machine 2, the membrane layer intersects with other membrane layers 1 under the traction of a traction structure of the extruding machine 2. In the present specific embodiment, the extruding machine 2 adopts a single-layer casting extruding machine 2. Since the structural configuration of the extruding machine 2 is common knowledge of a person skilled in the art, the description thereof will not be repeated here.
[31] In the present specific embodiment, the pressure roller 3 is provided with a heating element therein, and the pressure roller 3 is capable of integrally hot-pressing the stacked membrane layers 1. In other specific embodiments of the present invention, a separate heating unit may also be used to heat the pressure roller 3 or the stacked membrane layers 1 to complete the pressing.
[32] In addition, the PVDF membrane preparation device further includes an edge cutting assembly. The edge cutting assembly is arranged on a side of the pressure roller
3 away from the extruding machine 2, and the edge cutting assembly is capable of cutting a film obtained after laminating the membrane layers 1. An intersection overlapping part of the stacked member layers 1 is remained after cutting, and the other parts are cut off to obtain a finished PVDF membrane.
[33] Besides, the present invention also provides a PVDF membrane preparation method, including: stacking at least two single membrane layers 1 in which the at least two membrane layers 1 are not arranged in parallel, and integrally solidifying an intersection of the membrane layers 1 to obtain a PVDF membrane.
[34] According to the PVDF membrane preparation method of the present invention, at least two single membrane layers 1 are stacked, and the at least two membrane layers 1 are not arranged in parallel. After integrally solidifying an intersection of the at least two membrane layers 1, a PVDF membrane with an improved transverse tensile strength is obtained, thereby improving the overall performance of the PVDF membrane, and prolonging the service life of a photovoltaic module.
[35] Further, the number of the membrane layers 1 is 2-5, and an angle between the two membrane layers 1 is not greater than 90°. When there are three membrane layers 1, an angle between two adjacent membrane layers 1 1s 0-80°. The number of the membrane layers 1 and an arrangement angle of the membrane layers 1 may be adjusted according to actual production requirements, so as to improve the flexibility and adaptability of the preparation method. When there are more than three membrane layers 1, two membrane layers 1 arranged in parallel are included. Two membrane layers 1 arranged in parallel may be arranged at the bottommost and the topmost parts.
[36] Furthermore, the member layers 1 are extruded by the extruding machines 2. An intersection of multiple membrane layers 1 is integrally hot-pressed to obtain a PVDF membrane. A preparation temperature of the PVDF membrane is 170-230°C. A melting point of PVDF is about 167°C. A hot-pressing temperature may be controlled at 170- 180°C. An extrusion temperature is also different in different regions of the extruding machines 2. The temperature of a feeding region is generally low to be about 170°C, and gradually increases to a stable value. In practice, a processing temperature may be adjusted to accommodate changes in material composition.
[37] According to the PVDF membrane of the present invention, after two non- parallel membrane layers 1 are stacked and connected, tensile strength in a non-length direction is increased, thereby increasing the transverse tensile strength and overall performance of the PVDF membrane. The transverse tensile performance of the PVDF membrane of the present invention is further verified through specific comparative examples.
[38] Asa comparison, the initial performances of a unidirectionally stretched PVDF membrane in the prior art are as follows:
[39] Tensile strength: 26 MPa, and elongation at break: 350% (transverse normal temperature);
[40] Tensile strength: 40 MPa, and elongation at break: 300% (longitudinal normal temperature);
[41] Tensile strength: 31 MPa, and elongation at break: 25% (-40°C in a transverse direction),
[42] Tensile strength: 45 MPa, and elongation at break: 250% (-40°C in a longitudinal direction),
[43] Tensile strength: 23 MPa, and elongation at break: 0% (UV60Kwh+DH1000h+UV 120Kwh+TC200+ -40°C in a transverse direction);
[44] Tensile strength: 45 MPa, and elongation at break: 150% (UV60Kwh+DH1000h+UV 120Kwh+TC200+ -40°C in a longitudinal direction).
[45] Example 1
[46] Two membrane layers 1 are stacked, and an angle between the two membrane layers 1 is 60°. The performances of an obtained PVDF membrane are as follows:
[47] Tensile strength: 31 MPa, and elongation at break: 330% (transverse normal temperature),
[48] Tensile strength: 42 MPa, and elongation at break: 300% (longitudinal normal temperature);
[49] Tensile strength: 39 MPa, and elongation at break: 180% (-40°C in a transverse direction);
[50] Tensile strength: 46 MPa, and elongation at break: 250% (-40°C in a longitudinal direction),
[51] Tensile strength: 29 MPa, and elongation at break: 50% (UV60Kwh+DH1000h+UV 120Kwh+TC200+ -40°C in a transverse direction);
[52] Tensile strength: 45 MPa, and elongation at break: 150% (UV60Kwh+DH1000h+UV120Kwh+TC200+ -40°C in a longitudinal direction). [S3] Example 2
[54] Three membrane layers | are stacked, and an angle between two adjacent membrane layers 1 is 45°. The performances of an obtained PVDF membrane are as follows: [S5] Tensile strength: 43 MPa, and elongation at break: 310% (transverse normal temperature);
[56] Tensile strength: 42 MPa, and elongation at break: 330% (longitudinal normal temperature),
[57] Tensile strength: 49 MPa, and elongation at break: 180% (-40°C in a transverse direction); [S8] Tensile strength: 47 MPa, and elongation at break: 260% (-40°C in a longitudinal direction);
[59] Tensile strength: 45 MPa, and elongation at break: 190% (UV60Kwh+DH1000h+UV 120Kwh+TC200+ -40°C in a transverse direction);
[60] Tensile strength: 43 MPa, and elongation at break: 210% (UV60Kwh+DH1000h+UV120Kwh+TC200+ -40°C in a longitudinal direction).
[61] Example 3
[62] Four membrane layers | are stacked, and an angle between two adjacent membrane layers 1 is 30°. The performances of an obtained PVDF membrane are as follows:
[63] Tensile strength: 43 MPa, and elongation at break: 310% (transverse normal temperature);
[64] Tensile strength: 42 MPa, and elongation at break: 330% (longitudinal normal temperature);
[65] Tensile strength: 49 MPa, and elongation at break: 180% (-40°C in a transverse direction);
[66] Tensile strength: 47 MPa, and elongation at break: 260% (-40°C in a longitudinal direction),
[67] Tensile strength: 45 MPa, and elongation at break: 230% (UV60Kwh+DH1000h+UV 120Kwh+TC200+ -40°C in a transverse direction);
[68] Tensile strength: 43 MPa, and elongation at break: 220% (UV60Kwh+DH1000h+UV 120Kwh+TC200+ -40°C in a longitudinal direction).
[69] By comparing the above test data, it can be seen that the PVDF membrane of the present invention has significantly improved transverse tensile performance and overall performance.
[70] As a weather-resistant coating for a photovoltaic backplane, a PVDF fluoride film provides protective functions for the photovoltaic backplane, such as aging resistance, ultraviolet resistance, wind and sand resistance, high and low temperature resistance, and flame retardance, and the service life of photovoltaic modules can be prolonged. In photovoltaic applications, PVDF needs to be made into films with a certain tensile strength, and cracking, low-temperature transverse embrittlement, insufficient toughness and other problems are effectively avoided through molecular design, physical modification, double-draw process, and other manners. The method of the present invention can achieve the effect of a double-draw process with a unidirectional drawing process.
Claims (5)
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